Rear portion of a percussive high frequency chest wall oscillation system



FIG. 1 is a front perspective view of a rear portion of a percussive high frequency chest wall oscillation system in accordance with the present design;

FIG. 2 is a front elevation view thereof;

FIG. 3 is a rear elevation view thereof;

FIG. 4 is a right side elevation view thereof;

FIG. 5 is left side elevation view thereof;

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a bottom plan view thereof.

The broken lines depict portions of the rear portion of the percussive high frequency chest wall oscillation system and form no part of the claimed design. 

CLAIM The ornamental design for a rear portion of a percussive high frequency chest wall oscillation system, as shown and described. 